Crofton-Odenton

EWG's drinking water quality report shows
results of tests conducted by the water utility and provided to the Environmental Working Group by the Maryland Department of the Environment, as well as
information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the EPA (July 2018 - September 2018), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

Includes chemicals detected in 2015 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015, for which annual utility averages exceeded a health guideline established by a federal or state public health authority.

Chlorate

harm to the thyroid✕

Chlorate forms in drinking water as a byproduct of disinfection. Chlorate impairs thyroid function, making chlorate exposure most harmful during pregnancy and childhood.

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:210 ppb

114.0 ppb

152.0 ppb

372.5 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.

Health risks of chlorate in excess of health guideline

The health guideline of 210 ppb for chlorate was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against hormone disruption.

Chromium (hexavalent)

cancer✕

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:0.02 ppb

0.782 ppb

0.198 ppb

0.0308 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.

Health risks of chromium (hexavalent) in excess of health guideline

The health guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

Total trihalomethanes (TTHMs)

cancer✕

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform.

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:0.8 ppb

LEGAL LIMIT:80 ppb

23.7 ppb

8.58 ppb

6.20 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.

Health risks of trihalomethanes in excess of health guideline

The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

Includes chemicals detected in 2015 for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015, for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority.

Barium

✕

Barium is a mineral present in rocks, soil and water. High concentrations of barium in drinking water increase the risk of cardiovascular disease and hypertension.

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:700 ppb

LEGAL LIMIT:2,000 ppb

68.2 ppb

29.8 ppb

12.0 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.

Health risks of barium in excess of health guideline

The health guideline of 700 ppb for barium was defined by the Environmental Protection Agency as a children's health-based limit for 10-day exposure, a non-enforceable federal health advisory. This health guideline protects against harm to internal organs.

Haloacetic acids (HAA5)

✕

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid.

STATE

NATIONAL

THIS UTILITY

How your levels compare

LEGAL LIMIT:60 ppb

12.9 ppb

13.0 ppb

6.70 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.

Strontium

Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health.

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:1,500 ppb

357.2 ppb

113.8 ppb

22.3 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.

Health risks of strontium in excess of health guideline

The health guideline of 1,500 ppb for strontium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against harm to bones.

Vanadium

Vanadium is a metal used in steels and other alloys. People are commonly exposed to vanadium in water and food. Excessive exposure can be toxic during pregnancy and childhood.

STATE

NATIONAL

THIS UTILITY

How your levels compare

HEALTH GUIDELINE:21 ppb

1.98 ppb

0.138 ppb

0.283 ppb

The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.

Health risks of vanadium in excess of health guideline

The health guideline of 21 ppb for vanadium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against change in blood chemistry.